trimethoprim

[ trahy-meth-uh-prim ]
/ traɪˈmɛθ ə prɪm /

noun Pharmacology.

a synthetic crystalline compound, C11H18N4O3, usually combined with a sulfonamide as an antibiotic preparation in the treatment of urinary tract infections and pneumocystis pneumonia.

Origin of trimethoprim

1960–65; trimetho(xyphenyl) + p(y)rim(idinediamine), components of its chemical name